runtime/syntax: Highlight built-in constants in Python

runtime/doc/syntax.txt

@@ -3222,7 +3222,7 @@ Pascal.  Use this if you don't use assembly and Pascal: >
 
 PYTHON						*python.vim* *ft-python-syntax*
 
-There are six options to control Python syntax highlighting.
+There are seven options to control Python syntax highlighting.
 
 For highlighted numbers: >
 	:let python_no_number_highlight = 1
@@ -3242,10 +3242,13 @@ The first option implies the second one.
 For highlighted trailing whitespace and mix of spaces and tabs: >
 	:let python_space_error_highlight = 1
 
+For highlighted built-in constants distinguished from other keywords:
+	:let python_constant_highlight = 1
+
 If you want all possible Python highlighting: >
 	:let python_highlight_all = 1
-This has the same effect as setting python_space_error_highlight and
-unsetting all the other ones.
+This has the same effect as setting python_space_error_highlight,
+python_constant_highlight and unsetting all the other ones.
 
 If you use Python 2 or straddling code (Python 2 and 3 compatible),
 you can enforce the use of an older syntax file with support for

runtime/syntax/python.vim

@@ -34,6 +34,7 @@
 "   let python_no_exception_highlight = 1
 "   let python_no_number_highlight = 1
 "   let python_space_error_highlight = 1
+"   let python_constant_highlight = 1
 "
 " All the options above can be switched on together.
 "
@@ -85,6 +86,7 @@ if exists("python_highlight_all")
     unlet python_no_number_highlight
   endif
   let python_space_error_highlight = 1
+  let python_constant_highlight = 1
 endif
 
 " Keep Python keywords in alphabetical order inside groups for easy
@@ -367,6 +369,13 @@ if exists("python_space_error_highlight")
   syn match   pythonSpaceError	display "\t\+ "
 endif
 
+" Built-in Constants
+" https://docs.python.org/3/library/constants.html
+if exists("python_constant_highlight")
+  syn keyword pythonBoolean	False True
+  syn keyword pythonConstant	None NotImplemented Ellipsis __debug__
+endif
+
 " Do not spell doctests inside strings.
 " Notice that the end of a string, either ''', or """, will end the contained
 " doctest too.  Thus, we do *not* need to have it as an end pattern.
@@ -434,6 +443,10 @@ if !exists("python_no_doctest_highlight")
   hi def link pythonDoctest		Special
   hi def link pythonDoctestValue	Define
 endif
+if exists("python_constant_highlight")
+  hi def link pythonBoolean		Boolean
+  hi def link pythonConstant		Constant
+endif
 
 let b:current_syntax = "python"
 

runtime/syntax/testdir/dumps/python_constants_default_00.dump

@@ -0,0 +1,20 @@
+>#+0#0000e05#ffffff0| |B|u|i|l|t|-|i|n| |C|o|n|s|t|a|n|t|s| +0#0000000&@54
+|#+0#0000e05&| |h|t@1|p|s|:|/@1|d|o|c|s|.|p|y|t|h|o|n|.|o|r|g|/|3|/|l|i|b|r|a|r|y|/|c|o|n|s|t|a|n|t|s|.|h|t|m|l| +0#0000000&@24
+@75
+|#+0#0000e05&| |V|I|M|_|T|E|S|T|_|S|E|T|U|P| |u|n|l|e|t| |g|:|p|y|t|h|o|n|_|c|o|n|s|t|a|n|t|_|h|i|g|h|l|i|g|h|t| +0#0000000&@24
+|t|e|s|t| |=| |F+0#00e0e07&|a|l|s|e| +0#0000000&@62
+|t|e|s|t| |=| |T+0#00e0e07&|r|u|e| +0#0000000&@63
+|t|e|s|t| |=| |N+0#00e0e07&|o|n|e| +0#0000000&@63
+|t|e|s|t| |=| |N+0#00e0e07&|o|t|I|m|p|l|e|m|e|n|t|e|d| +0#0000000&@53
+|t|e|s|t| |=| |E+0#00e0e07&|l@1|i|p|s|i|s| +0#0000000&@59
+|t|e|s|t| |=| |_+0#00e0e07&@1|d|e|b|u|g|_@1| +0#0000000&@58
+@75
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+| +0#0000000&@56|1|,|1| @10|A|l@1| 

runtime/syntax/testdir/dumps/python_constants_highlight_00.dump

@@ -0,0 +1,20 @@
+>#+0#0000e05#ffffff0| |B|u|i|l|t|-|i|n| |C|o|n|s|t|a|n|t|s| +0#0000000&@54
+|#+0#0000e05&| |h|t@1|p|s|:|/@1|d|o|c|s|.|p|y|t|h|o|n|.|o|r|g|/|3|/|l|i|b|r|a|r|y|/|c|o|n|s|t|a|n|t|s|.|h|t|m|l| +0#0000000&@24
+@75
+|#+0#0000e05&| |V|I|M|_|T|E|S|T|_|S|E|T|U|P| |l|e|t| |g|:|p|y|t|h|o|n|_|c|o|n|s|t|a|n|t|_|h|i|g|h|l|i|g|h|t| |=| |1| +0#0000000&@22
+|t|e|s|t| |=| |F+0#e000002&|a|l|s|e| +0#0000000&@62
+|t|e|s|t| |=| |T+0#e000002&|r|u|e| +0#0000000&@63
+|t|e|s|t| |=| |N+0#e000002&|o|n|e| +0#0000000&@63
+|t|e|s|t| |=| |N+0#e000002&|o|t|I|m|p|l|e|m|e|n|t|e|d| +0#0000000&@53
+|t|e|s|t| |=| |E+0#e000002&|l@1|i|p|s|i|s| +0#0000000&@59
+|t|e|s|t| |=| |_+0#e000002&@1|d|e|b|u|g|_@1| +0#0000000&@58
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+| +0#0000000&@56|1|,|1| @10|A|l@1| 

runtime/syntax/testdir/input/python_constants_default.py

@@ -0,0 +1,11 @@
+# Built-in Constants
+# https://docs.python.org/3/library/constants.html
+
+# VIM_TEST_SETUP unlet g:python_constant_highlight
+test = False
+test = True
+test = None
+test = NotImplemented
+test = Ellipsis
+test = __debug__
+

runtime/syntax/testdir/input/python_constants_highlight.py

@@ -0,0 +1,10 @@
+# Built-in Constants
+# https://docs.python.org/3/library/constants.html
+
+# VIM_TEST_SETUP let g:python_constant_highlight = 1
+test = False
+test = True
+test = None
+test = NotImplemented
+test = Ellipsis
+test = __debug__